7279399891 has 2 divisors, whose sum is σ = 7279399892. Its totient is φ = 7279399890.

The previous prime is 7279399861. The next prime is 7279399921. The reversal of 7279399891 is 1989939727.

It is a balanced prime because it is at equal distance from previous prime (7279399861) and next prime (7279399921).

It is a cyclic number.

It is not a de Polignac number, because 7279399891 - 2²⁵ = 7245845459 is a prime.

It is not a weakly prime, because it can be changed into another prime (7279399861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3639699945 + 3639699946.

It is an arithmetic number, because the mean of its divisors is an integer number (3639699946).

Almost surely, 2^7279399891 is an apocalyptic number.

7279399891 is a deficient number, since it is larger than the sum of its proper divisors (1).

7279399891 is an equidigital number, since it uses as much as digits as its factorization.

7279399891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15431472, while the sum is 64.

The square root of 7279399891 is about 85319.3992653488. The cubic root of 7279399891 is about 1938.0509609292.

The spelling of 7279399891 in words is "seven billion, two hundred seventy-nine million, three hundred ninety-nine thousand, eight hundred ninety-one".